If your running gas heat it's 5/8 3/8 tubing.If it's elec. heat it's 3/4 3/8 tubing. Etheirway 3/4 3/8 works for both. Use 6 wire for tstat from tstat to furnace or air handler, and you need is 2 wire from condensing unit [outside] to furnace or air handler or anything more than two.

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Related Questions:

What is current refrigerant being used in the system being replaced? What are the sizes of the existing breakers for the Air Handler, and the outside unit? Do you plan on replacing cooper lines ? Use drain line already there?

Check the outdoor unit you should have hot air discharging out the top of the condensor. The insulated suction line should be sweating. The inside
coile should be condensating and water should be flowing to a drain from the indoor unit.

If all of that is happening, then I would say you now
have a ubdersized unit. If none of that is happening
then I would say you are low on refrigerant.

Goodman unit you can use a 1/4 hp or 1/3 hp cond. fan motor but it does sound like a cap. Replace cap first. Its very easy to do just open up panel and replace the silver bullet with terminals out the top. It will say on the side what size it is like 40uf 5uf or something like that. Thats most likely your problem. Russ

Depending on the size of your Electric heat you can use one set of wires because your unit does not run with the heat like the heat pump. The large set of wires going to the electric heat should be used. You may have to jumper a new set to the contactor. On Goodman unit come in L1 and L2 jumper to contactor. Very simple good luck. Rus

You MUST WEIGH IN THE NEW CHARGE OF R-22. There should be a label on the side of the a/c unit that states what the factory charge was. This is only a starting point. Once you have the factory charge in the system, then turn on the unit and allow it to stabilize (5 min) . Check pressure on low side and check teperature on low side pipe. Temperature of pipe should be 8 to 15 degrees above what the boiling point of the refrigerant is for the current pressure you are reading. If the temperature is more than 15 degrees, add R-22 in 4oz increments allowing 5min in between each time you add until you are in the "zone". When you do this, your head pressure needs to be 225-250. if you need to cover the coil or block the outdoor fan to do this then do it. Hook up the vacuum pump and start over

MOST ALL GOODMAN ( UP TO 3 TONS)INTERNAL FILTERS ARE 22" x 22" X 1". YOU CAN GET THEM ON LINE AT www.filtera.com.
ALWAYS TAKE A TAPE RULE AND OPEN THE BOTTOM FILTER DOOR AND MEASURE THE FILTER RACK.
MAKE SURE YOU DO NOT HAVE A RETURN-AIR FILTER-GRILLE. LARGE WHOLE -HOUSE RETURN AIR VENT NEAR OR AT YOUR FURNACE, A/C AIR HANDLELER.
Joe_Rex New Member of FixYA
Retired HVAC&R contractor 45+ years exp.